Optimasi Formula Sediaan Krim Ekstrak Kulit Putih Buah Semangka (Citrullus lanatus (Thunb.) Matsum & Nakai) sebagai Antijerawat: Optimization of Cream Formula from Watermelon White Skin Extract (Citrullus lanatus (Thunb.) Matsum & Nakai) as an Antiacne - Ni Made Mela Santi; Nurul Fitriani; Hadi Kuncoro (Proceeding of Mulawarman Pharmaceuticals Conferences, 2022)